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Geologic Hazards

Volcanoes, earthquakes, tsunamis, landslides, expansive soils and more

Most Powerful Eruption of the 20th Century: One hour later, the blast was heard in Juneau.
Tsunami Causes
Tsunami causes
What Causes a Tsunami? Learn how plate motions trigger earthquakes and tsunamis.
Rock Fall Photos
Yosemite rock fall hazards
Yosemite Rock Fall Photos: A photo sequence of a rockfall and debris avalanche by Herb Dunn.
"We learn geology the morning after the earthquake."
Ralph Waldo Emerson
Abandoned Mines
abandoned mines
Abandoned Mine: accidents take 20 to 30 lives per year. Many can be prevented with education.
Expansive Soils
Expansive soils map
Expansive Soil: Causes more damage than earthquakes, floods, hurricanes & tornadoes combined.
Landslides: A USGS fact sheet about landslides and events that trigger them.
"Oil is found in the minds of men."
Wallace Pratt
Volcanic Explosivity
volcanic explosivity index
Volcanic Explosivity: Rating volcanic eruptions based upon the volume of tephra ejected.
Volcano articles
Volcanoes: Articles about volcanoes, volcanic hazards and eruptions past and present.
San Andreas Map
San Andreas Fault
Google Map of the San Andreas Fault: Zoom in to see the fault trace plotted atop of a map or satellite images.
"The present is the key to the past."
Charles Lyell
Impact Craters
Impact craters map
Asteroid Impact Craters! Zoom in on 50 of Earth's largest impact craters.
Hurricane Insurance
Homeowner's insurance
Homeowner's Insurance and Geologic Hazards: Most policies do not cover geologic hazards such as landslide damage.
New Madrid Mystery
New Madrid Fault Earthquakes
New Madrid Earthquakes: Why do large earthquakes occur far from an active plate boundary?
"The best geologist is the one who has seen the most rocks."
Herbert Harold Read

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